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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64e3f3c5e597b9abf7bde50a063f3c92f4d861d2a447a6452a2b7fb9e15aa238' 
  AND token = '6/KCC2duMUPoyCBfgu+6B/ZaoMPNHklkuaceLULT958=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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