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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00f0a4497d074ce6ac0a5e85218d5e902cd0729fa9b19d11d59dc5cb99ad1752' 
  AND token = 'gz6i6+ojooz2mIWHeJtd9tOhVqpsC13mo/8JprYQ3HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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