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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afb620a87aba0dfa9fa94bfa3c2e46944d59f01413977e2cb5b0ba938b72cb5c' 
  AND token = 'v3Xy9qNHrVi/dxSKdX78sbpnsC+HDZlnpd9y+Ey566g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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