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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd1bd275e47c485542f2e76ba4a2d3d934890ed20938f6296661571d485fd64' 
  AND token = '7QBuYSBh75W/jWRLZ5HE/5N8qlUN5Nq5zkDpdEbVe5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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