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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c655b4f9baf125a581065d8440d36cc4b67f672511da52b54cc2bcaff1b03004' 
  AND token = 'HVoReSf4/mzXI42TWtA3VHX4dadfMrq9MFyCt5fV4bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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