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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f76d6635190e1f31d650d0479984e77a2a508b8899ef6188c7f89cc34eb51cc' 
  AND token = 'Ud3TouoofIjuskbNXGy69cLS0yG4Tj5zDo6yXBulO0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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