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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08790cf85441403baba111cf7da8610907d814588fbf865d5a79f2d9d915aee3' 
  AND token = '6lBdXbE6mklUXVGQNtqUKOjFOXoz2F4eER8HRcNE4FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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