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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fe0e8ce709f37c8b9fd9238574cbde824e25afc37bb2582acda410b26df4253' 
  AND token = 'Mji5Nq5M9nXaZFMU52fQ6dHLkStWbs+LpOXL9z3gG+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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