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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac8ea8e96396c33e2a5a378d88bbf04132fed8239abd8c05dbf13f6a1d31e56' 
  AND token = 'TqqIuWLGPQagh5T812V0ARkJfPGYIWz/GqVoiYjbwTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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