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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd27285751f70ac5373eaaf4361153cff7b01ac224e0a7c4d052343fdc737185f' 
  AND token = 'NOzH7TQHsETAJQBjNIUzTN86HLZHmcw5yRs7kBC7PlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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