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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7982de86010f7c943dfde3a6500d20c3f5aec5fed56590282507537f39c0e32' 
  AND token = '9a8zkHI/sf/3GuyedSOs62PL6PJM2XxaUpZMVZ6rn/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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