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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a976806142a5dc0d98f69f7d80c2fdff9ec86642cbddf91953155c2af8039f8d' 
  AND token = 'DUpzgd4d7sgqnT4bmoaT3AFhTh+qBrNMupvdJ2xzBug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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