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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '150f003aa9f84c0ae4418f046f580b9cf1afb757b4886d8232b9bfc28f4117e0' 
  AND token = 'jf+5oz9XknS/cKl6Pnz3zKcYq1+zS6Mv6n9TeEB1J24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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