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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b816f20106a26c65e3d1d4186ac70d0cc04eaca3eed771ffbf241b96480da1' 
  AND token = 'lLWnaR2vxerqp3tBu5jp2PDilMXKQCiKYJFOGySlwqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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