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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a25f98eb315f12e3f7ef510cb5a93b37e3d9d98a280b009a889f3d038264c62' 
  AND token = 'hz3ofSnT5r8uixPefn+D1iQkDeX0GLQ1SocYGcE2ofg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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