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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc58ffd68146eed61f54c1ab0510abbba2ae679f9e09bfe9a1d32a43baed0f5' 
  AND token = '5M2/VPvtQVzzgIDIrbHNQlbL5y6/5VWli5Kgw+S8uGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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