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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f651936bf4857fa0533973c092788c0b6040193861d2be81f7bab6e36050b949' 
  AND token = 'EKxJ9xAoxR47abilOdo4u3KkyviYMt4RGa0PPTVi67c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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