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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79fd925d0f1f657d15ccc985f8e8df6dc070bf1724c25f69a708b4d421de8e70' 
  AND token = 'xpfsB+MP8FOgv3n6zzCXz1i+VT2xJDDktBaEdWpzur8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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