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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61a558073082c816dfd0352637ce5e6746164482a068704966e2243c40c7b862' 
  AND token = 's+/Jv+lxDjcZJB4F+6KvGYm/ns9km2H0ueK/qpq4d2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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