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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23305d28d58bbbd0d69fcc1c255deaae2d88eb6227573db6898e0cf19dfb958' 
  AND token = 'Cersh19o+C6NekZUq4WcnWqlNYZ3rgJgFpmNGAgGpIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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