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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ea90eedf2ec5e017d0261a60be8595722d06198c52e7d2d06dc0edb0907401' 
  AND token = 'bl55u0lXp9L5brR/wHm3g++ubSKAm8w2udTXaw6iyho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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