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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a0441b30369841f8eb38ba16ef34c6d04adb7e2f5ad045d31550eac5ff5ff9e' 
  AND token = 'GxwKjyH8ic3vB00RIf4zBr5IZq/eafT7IgX+JkhAsXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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