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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a264affc134b531f5985f851ab220b9e16ff568e4f18977d3d011f0dc32cd59b' 
  AND token = 'xz2yvyvaL6mLVy+7AOoRTIwd+zQfqiFHIxyqiz0N+KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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