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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04691f2ffa536b6e0ac0518aa28dbfefc077f55f88ae278b1d69edd78d3cab88' 
  AND token = 'H4ASzKTysUdXAclmR+qPQMB0wiQtkHMk4754tVmb7EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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