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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e91606990326e4284e6ed2bd9f5c918b855ffc260fd0b4e725320b879ef4deef' 
  AND token = 'U2Q6nx0iyJJJrCA5j+pO50IypUPONWok47NjR+Lmk7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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