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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f77960c4150adbc5b0052200933abda09a503d2fb1c178c6dac724af355ffa56' 
  AND token = 'zbRR2N30yHp1Y9Z/faWP14StUn6GVOQeZkKu923RHXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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