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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3b00c7fb1c9ca2e815971d91d153f3ca79aedb0605e9053d30b4ce60360632a' 
  AND token = 'CK9OpouGm2yyAagVoqbOx+CCcxKOcL/xLqXepd0kBRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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