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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e38870920081d22063eb03b0559bfb0652f5336df7d30663d89494ba4942bc' 
  AND token = 'wRcflCV/yEnoeknE6lySYBM49EBN75EICr5T+2e4T2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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