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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2991f0d633ad716eb344fc4c7621ed5511a17e90fb59a263f755a8f2bb2855bb' 
  AND token = '1SvhFOAsDQdM835a+VdUHVl9Yzn5L0/n/PNqfU4ta3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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