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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a798b06ac518b51862e22b8cd2c472cf4757d9e418dae6531f4a314578f6b33' 
  AND token = 'ZUenPnDJ0gGUgr55n6O5jK6iOhNOsXoQW7dqC6Cgkbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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