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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bed2085cc969e32e0e31beb91efcd9db6f49943d34b9a4af55a5800018d5d49' 
  AND token = 'b7KmleIZG0yyCe37Rsolb/1N7Ll+2XQXTyxWMmKAxqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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