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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c4e5ff59a3a38fc03d0d71dd41640e95c4a1a651168b662d1d0f70297cc7a5' 
  AND token = 'oRcJQle2OWQsDapYLVGovONjEVkuFu/YCOC70qiy+bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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