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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca0a36c0f3aba464c95ea3cd1132472d6a4edec8f32bf3b3f419fe4f8a196084' 
  AND token = 'pgW/cG4zelRFpFP2EUoNDq1+TmjjmBqCnBqiD+RaXt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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