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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f040e3e5623375df2b788d1818f09ac708801ccb264bfde969d2e8c1f21a28' 
  AND token = 'Eq+fwtlf4RigITxDnNn8JOj8m/XVkjA6JvpXmTF50Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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