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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1146f0f7aeec9ef0a043464f6528b49fa46e9b2ad33102932983a3e6a367512' 
  AND token = '0hpyVhFaAPiF0gT4sF3g498RbJtJei6Yl1O4o5tgevw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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