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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb3031e8ba6ae96704ca160e3b8152f10f2ca8dc359bfe451038d62c1ef99274' 
  AND token = 'T3bJLpmRXdLAGoIiNY6B6SbvL2Uc+fdjb8q+89cl/DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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