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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3644d887d8a14dc3e848c0cd10bb49dc2ac2c633fe4355c42ecb533762b8b738' 
  AND token = 'L27/x1D+YHKDo/aLeO6+voqYKpvrlb1b7QLK94U+1CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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