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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '426612051a458e43daed59498684525fa03dacfbb0e5a17c8aa721ef7a9a6947' 
  AND token = 'q7ojbHGP9heOWiNP+Gp3acv/iMGJnmH0FDh4IdZ5VT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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