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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '751009647de033a5ae561705efa3e186a72163aeaf4b18c9244db15c870cd2aa' 
  AND token = 'mymVaY8+3XklbQOtzLw59FOjetzJDkBBgbGP2GNmyus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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