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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db55ec76ef53344fd73addf4d1841e02ff2001bd88686e0ccae7a82f55fd883d' 
  AND token = 'Jir79YQdGkvdSGYDDScenVBpjV30RbBnI1haF3dXNkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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