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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de2cebbbdb78fb87385a8a32755252d3034e70e80513286ce93aaf88be43f440' 
  AND token = 'lRTtBr901GJGxAoijIaKTd61k/i2wFE19NXGWev0wtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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