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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf4c6a64e18611d3c52328792b6512c545c0652868fb6bb055690f25bb13b90' 
  AND token = 'H+aRZCir9MI48ilpJ49X6M1/jK3pDTLofBk+TcXdliY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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