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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f59d5d036b7df13a819d0856f77e0c2247e6ec228b36ad9ab5c2e232e995b9e0' 
  AND token = 'EgUkaBKECl87sNbaB1+wPs1y977Bu3UeqlAOg9I0nj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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