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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e1a68e32b7de8d84d2694f26f11d2e547071c70c4ed4b7bb1cce4c43b7b62a7' 
  AND token = 'p0fmnfd8j80eWbuDd3+W/MCK56gyb1E9ky5EJJChSjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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