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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e5e90bb265f96753fad36fb99f5ec259d9c24967a538296acdf3d09b2bc6b3' 
  AND token = '1a63ez6ewRHQhd1MHiEYQqejcnZzpsqagTGDNE9/SuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}