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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602068de5f9f0b7c6e6085fc58f7fcef6fa0e67b32b2d52590a719089c1703fb' 
  AND token = 'IRMOUOqWPAi175ykABlksr2GH89gFs+U/xvEdrQRoZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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